package com.example.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;

import java.security.Key;
import java.util.Date;
import java.util.Map;

@Slf4j
public class JwtUtils {
    private static final long expriation=60*60*24*1000;
    private static final String secretString="8inw5vUpSbO1sg2QGhe/3CjBq4RXg0RK2QfBOc9tDzk=";
    private static final Key key= Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));

    public static String genToken(Map<String,Object> claim){
        String token= Jwts.builder().setClaims(claim).
                setExpiration(new Date(System.currentTimeMillis()+expriation))
                .signWith(key)
                .compact();
        return token;
    }
    public static Claims parseToken(String token){
        if(token==null){
            return null;
        }
        JwtParser build=Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims=null;
        try{
            claims=build.parseClaimsJws(token).getBody();

        }catch (Exception e){
            log.error("解析token失败："+token);
        }
        return claims;
    }
    public static Integer getUserIdFromToken(String token){
        if(token==null){
            return null;
        }
        Claims claims= JwtUtils.parseToken(token);
        return (Integer) claims.get("userId");
    }
}
